gecko/content/base/public/nsINodeInfo.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* nsINodeInfo is an interface to node info, such as name, prefix, namespace
* ID and possibly other data that is shared between nodes (elements
* and attributes) that have the same name, prefix and namespace ID within
* the same document.
*
* nsNodeInfoManager's are internal objects that manage a list of
* nsINodeInfo's, every document object should hold a strong reference to
* a nsNodeInfoManager and every nsINodeInfo also holds a strong reference
* to their owning manager. When a nsINodeInfo is no longer used it will
* automatically remove itself from its owner manager, and when all
* nsINodeInfo's have been removed from a nsNodeInfoManager and all external
* references are released the nsNodeInfoManager deletes itself.
*
* -- jst@netscape.com
*/
#ifndef nsINodeInfo_h___
#define nsINodeInfo_h___
#include "nsISupports.h"
#include "nsIAtom.h"
#include "nsINameSpaceManager.h"
#include "nsNodeInfoManager.h"
#include "nsCOMPtr.h"
#ifdef MOZILLA_INTERNAL_API
#include "nsDOMString.h"
#endif
// Forward declarations
class nsIDocument;
class nsIURI;
class nsIPrincipal;
// IID for the nsINodeInfo interface
// 35e53115-b884-4cfc-aa95-bdf0aa5152cf
#define NS_INODEINFO_IID \
{ 0x35e53115, 0xb884, 0x4cfc, \
{ 0xaa, 0x95, 0xbd, 0xf0, 0xaa, 0x51, 0x52, 0xcf } }
class nsINodeInfo : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODEINFO_IID)
nsINodeInfo()
: mInner(nsnull, nsnull, kNameSpaceID_None),
mOwnerManager(nsnull)
{
}
/*
* Get the name from this node as a string, this does not include the prefix.
*
* For the HTML element "<body>" this will return "body" and for the XML
* element "<html:body>" this will return "body".
*/
void GetName(nsAString& aName) const
{
mInner.mName->ToString(aName);
}
/*
* Get the name from this node as an atom, this does not include the prefix.
* This function never returns a null atom.
*
* For the HTML element "<body>" this will return the "body" atom and for
* the XML element "<html:body>" this will return the "body" atom.
*/
nsIAtom* NameAtom() const
{
return mInner.mName;
}
/*
* Get the qualified name from this node as a string, the qualified name
* includes the prefix, if one exists.
*
* For the HTML element "<body>" this will return "body" and for the XML
* element "<html:body>" this will return "html:body".
*/
virtual void GetQualifiedName(nsAString& aQualifiedName) const = 0;
/*
* Get the local name from this node as a string, GetLocalName() gets the
* same string as GetName() but only if the node has a prefix and/or a
* namespace URI. If the node has neither a prefix nor a namespace URI the
* local name is a null string.
*
* For the HTML element "<body>" in a HTML document this will return a null
* string and for the XML element "<html:body>" this will return "body".
*/
virtual void GetLocalName(nsAString& aLocalName) const = 0;
#ifdef MOZILLA_INTERNAL_API
/*
* Get the prefix from this node as a string.
*
* For the HTML element "<body>" this will return a null string and for
* the XML element "<html:body>" this will return the string "html".
*/
void GetPrefix(nsAString& aPrefix) const
{
if (mInner.mPrefix) {
mInner.mPrefix->ToString(aPrefix);
} else {
SetDOMStringToNull(aPrefix);
}
}
#endif
/*
* Get the prefix from this node as an atom.
*
* For the HTML element "<body>" this will return a null atom and for
* the XML element "<html:body>" this will return the "html" atom.
*/
nsIAtom* GetPrefixAtom() const
{
return mInner.mPrefix;
}
/*
* Get the namespace URI for a node, if the node has a namespace URI.
*
* For the HTML element "<body>" in a HTML document this will return a null
* string and for the XML element "<html:body>" (assuming that this element,
* or one of it's ancestors has an
* xmlns:html='http://www.w3.org/1999/xhtml' attribute) this will return
* the string "http://www.w3.org/1999/xhtml".
*/
virtual nsresult GetNamespaceURI(nsAString& aNameSpaceURI) const = 0;
/*
* Get the namespace ID for a node if the node has a namespace, if not this
* returns kNameSpaceID_None.
*
* For the HTML element "<body>" in a HTML document this will return
* kNameSpaceID_None and for the XML element "<html:body>" (assuming that
* this element, or one of it's ancestors has an
* xmlns:html='http://www.w3.org/1999/xhtml' attribute) this will return
* the namespace ID for "http://www.w3.org/1999/xhtml".
*/
PRInt32 NamespaceID() const
{
return mInner.mNamespaceID;
}
/*
* Get and set the ID attribute atom for this node.
* See http://www.w3.org/TR/1998/REC-xml-19980210#sec-attribute-types
* for the definition of an ID attribute.
*
*/
nsIAtom* GetIDAttributeAtom() const
{
return mIDAttributeAtom;
}
void SetIDAttributeAtom(nsIAtom* aID)
{
mIDAttributeAtom = aID;
}
/**
* Get the owning node info manager. Only to be used inside Gecko, you can't
* really do anything with the pointer outside Gecko anyway.
*/
nsNodeInfoManager *NodeInfoManager() const
{
return mOwnerManager;
}
/*
* Utility functions that can be used to check if a nodeinfo holds a specific
* name, name and prefix, name and prefix and namespace ID, or just
* namespace ID.
*/
PRBool Equals(nsINodeInfo *aNodeInfo) const
{
return aNodeInfo == this || aNodeInfo->Equals(mInner.mName, mInner.mPrefix,
mInner.mNamespaceID);
}
PRBool NameAndNamespaceEquals(nsINodeInfo *aNodeInfo) const
{
return aNodeInfo == this || aNodeInfo->Equals(mInner.mName,
mInner.mNamespaceID);
}
PRBool Equals(nsIAtom *aNameAtom) const
{
return mInner.mName == aNameAtom;
}
PRBool Equals(nsIAtom *aNameAtom, nsIAtom *aPrefixAtom) const
{
return (mInner.mName == aNameAtom) && (mInner.mPrefix == aPrefixAtom);
}
PRBool Equals(nsIAtom *aNameAtom, PRInt32 aNamespaceID) const
{
return ((mInner.mName == aNameAtom) &&
(mInner.mNamespaceID == aNamespaceID));
}
PRBool Equals(nsIAtom *aNameAtom, nsIAtom *aPrefixAtom,
PRInt32 aNamespaceID) const
{
return ((mInner.mName == aNameAtom) &&
(mInner.mPrefix == aPrefixAtom) &&
(mInner.mNamespaceID == aNamespaceID));
}
PRBool NamespaceEquals(PRInt32 aNamespaceID) const
{
return mInner.mNamespaceID == aNamespaceID;
}
virtual PRBool Equals(const nsAString& aName) const = 0;
virtual PRBool Equals(const nsAString& aName,
const nsAString& aPrefix) const = 0;
virtual PRBool Equals(const nsAString& aName,
PRInt32 aNamespaceID) const = 0;
virtual PRBool Equals(const nsAString& aName, const nsAString& aPrefix,
PRInt32 aNamespaceID) const = 0;
virtual PRBool NamespaceEquals(const nsAString& aNamespaceURI) const = 0;
PRBool QualifiedNameEquals(nsIAtom* aNameAtom) const
{
NS_PRECONDITION(aNameAtom, "Must have name atom");
if (!GetPrefixAtom())
return Equals(aNameAtom);
const char* utf8;
aNameAtom->GetUTF8String(&utf8);
return QualifiedNameEqualsInternal(nsDependentCString(utf8));
}
PRBool QualifiedNameEquals(const nsACString& aQualifiedName) const
{
if (!GetPrefixAtom())
return mInner.mName->EqualsUTF8(aQualifiedName);
return QualifiedNameEqualsInternal(aQualifiedName);
}
/*
* Retrieve a pointer to the document that owns this node info.
*/
nsIDocument* GetDocument() const
{
return mOwnerManager->GetDocument();
}
protected:
virtual PRBool
QualifiedNameEqualsInternal(const nsACString& aQualifiedName) const = 0;
/*
* nsNodeInfoInner is used for two things:
*
* 1. as a member in nsNodeInfo for holding the name, prefix and
* namespace ID
* 2. as the hash key in the hash table in nsNodeInfoManager
*
* nsNodeInfoInner does not do any kind of reference counting,
* that's up to the user of this class. Since nsNodeInfoInner is
* typically used as a member of nsNodeInfo, the hash table doesn't
* need to delete the keys. When the value (nsNodeInfo) is deleted
* the key is automatically deleted.
*/
class nsNodeInfoInner
{
public:
nsNodeInfoInner(nsIAtom *aName, nsIAtom *aPrefix, PRInt32 aNamespaceID)
: mName(aName), mPrefix(aPrefix), mNamespaceID(aNamespaceID)
{
}
nsIAtom* mName;
nsIAtom* mPrefix;
PRInt32 mNamespaceID;
};
// nsNodeInfoManager needs to pass mInner to the hash table.
friend class nsNodeInfoManager;
nsNodeInfoInner mInner;
nsCOMPtr<nsIAtom> mIDAttributeAtom;
nsNodeInfoManager* mOwnerManager; // Strong reference!
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsINodeInfo, NS_INODEINFO_IID)
#endif /* nsINodeInfo_h___ */